Pantograph engraving-machine.



PATBNTED OCT. 13, 1903.

M. BARR.

PANTOGRAPH ENGRAVING MACHINE.

APPLICATION FILED MA1L3, 1902.

S-SHBET 1.

L E D 0 M 0 N PATENTED OCT 13, 1903.

M. BARR.

PANTOGRAPH ENGRAVING MACHINE.

APPLICATION FILED MAR. 3, 1902.

4 SHEETSSHEET 2.

N0 MODEL.

JZZWW wmom NORRIS No. 741,442. PATENTED OCT. 13, 1908.

' M. BARR.

PANTOGRAPH ENGRAVING MACHINE.

APPLICATION FILED MARH'IR, 1902.

N0 MODEL. 5

4 SHEETS-SHEET 3.

(fizz/ 13M, W, W. per .W

dliarrwy PATENTED OCT. 13, 1903.

M. BARR. PANTOGRAPH ENGRAVING MACHINE.

APPLICATION FILED MAR. 3 1902.

4 SHEETS-SHEET 4.

N0 MODEL.

ji mde I flaw/J Ei'o. 741,442.

lllnirrn Patented October 13, 1903.

VATENT anion.

MARK BARR, OF KENSINGTON, ENGLAND, ASSIGNOR TO THE LINOTYPE COMPANY,LIMITED, OF LONDON, ENGLAND.

PANTOGRAPH ENGRAVlNG ll/lACHlNE.

SEEQIFIGATION forming part of Letters Patent No. 741,442, dated October13, 1903.

Application filed March 3, 1902- Serial No. 96,509. (No model.)

.To aZZ whom it may concern:

Be it known that 1, MARK BARR, residing at No. 25 Kensington CourtGardens, Ken-' sington, in the county of Middlesex, England, haveinvented certain new and useful Improvements in PantographEngraving-.Machines, of which the following is a full, clear, and exactdescription, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to improvements in pantograph engraving-machines,and has for its principal object to construct such a machine so as toenable an operator to produce a line-engraving with lines ofgradually-varying depth and thickness without necessitating theemployment therefor of a speciallycut pattern, such as-has generallybeen used for the purpose, and the quality of which engraving shall beequal or superior to the best, hand-cut work. The cutting of theabovenamed pattern has hitherto necessitated the employment ofhighly-skilled labor and has therefore proved to be a very expensiveoperation. By the employment of a machine constructed according to thepresent invention the necessity for this expense is entirely overcome,and although, if such be desired, the resultant engraving maybeidentical with the original the operator has means at his commandwhereby he can vary the treatment of the subject engraved according torequirements.

The invention may be said to consist, essentially, in substituting forthe usual tracer a rotating conical cutting-tracer generally homologouswith the engraving-tool and in employing a pattern depicted upon thesurface of a plate, block, or other body of a friable material, such asgypsum or plaster-ofparis, which can be readily cut away by the saidcutting-tracer without presenting undue or excessive resistance to itsmanipulation by the operator.

The pantograph engravingmachine employed is of the three-dimension type,and as a convenient example it is herein described as substantially ofthe construction set forth in the specification of Letters Patent N 0.684,973.

Referring to the accompanying drawings,

which are to be taken as part of this specification and read therewith,Figure 1 is a side elevation, and Fig. 2 a plan, of theengraving-machine; Fig. 3, a side elevation of part of the machine,showing the cutting-tracer in a position different from that in which itis shown in Fig. 1; Fig. 1, a plan of Fig. 3, and Fig. 5 a verticalsection on line 5 5 of Fig. 3 looking toward the left of that figure andwith the quill-holder shown partly in elevation. Figs. 3, 4c, and 5 aredrawn to a scale larger than that to which Figs. 1 and 2 are drawn.

races 7, between it and the plate 8, and the plate 8 upon ball-races 8,between it and the table 9, adjustable on the base 1 10, 10 10", and 10are the four links of a pantograph which has its center upon a verticalpost 11, fast to the base 1, and the link 10 of which is pivotallyconnected to the column 6 in order that the motion imparted to thepantograph may be communicated to the work 4.

12 is astraight rigid bar connected to the pantograph by being passedthrough three sockets 13, 14:, and 15 in pivotal connection with thesaid pantograph, the bar being rigidly fixed in the socket 15, but freeto slide through the sockets 13 and 14: as the linkage shortens andlengthens. The end of the bar 12 adjacent to the pattern-table 2projects beyond that table for a short distance and is secured in asocket 16 on the upper end of a pillar 17-, whose lower end is providedwith a roller 18, adapted to travel to and fro along a fixed arcualtrack 19 as the pantograph is rocked on its center 11.

The link 10 near that end at which it is pivoted to the link 10 isrigidly secured in a socket 20, on the upper end of a pillar 21, whoselower end is provided with a roller 22, adapted to travel to and froalong a fixed arcual track 23 as the pantograph is rocked on its center.The two arcual tracks 19 and 23 are rigidly secured to the machine-base1.

The cutting-tracer 24,as shown most clearly in Fig. 5, iscarried in aquill 25, rotatably mounted in a quill-holder 26, axially adjustable ina constantlyvertical tube or bush 27. This tube or bush is adapted toslide axially through a sleeve 28, fixed in the link of the pantographadjacent to the beforementioned socket 13. The sleeve 28,as shown inFig. 5, may most conveniently be formed as a hollow bolt, the head 28 ofwhich is situated above a flange 13, integral with the socket 13, andwhich bolt, conjointly with a screw-threaded nut 28 on its lower end,serves to firmly secure the said socket to the link 10. The top of thetube or bush 27 carries two pins 30 30, constituting a cross-head, whichengage with slotted arms 31 31, projecting forward from a boss 32,slidable along a longitudinally-grooved rod 33, the said boss beingconnected to the rod 33 by a featherand-groove connection 34,whichprevents any independent rotary motion of these two parts.

The quill 25 is provided at its upper end with a pulley 35, around whichpasses a driving-belt 36, driven by (most conveniently) an electricmotor 37, which, as shown in Figs. 1 and 2, may be secured upon thepantographlink 10, the said motor also being preferably provided with oradapted to operate a suction fan or exhauster 38, which, by asuctionpipe 39, terminating adjacent to the cut-tingtracer 24, withdrawsthe powder or particles produced by the cutting of the pattern 3 todeliver them through a discharge-pipe into any desired receptacle or atany desired outlet.

The quill-holder 26 has a screw-threaded nut 41 adjustable upon it nearits upper end, said nut, by hearing at its under side upon the top ofthe tube or bush 27, serving to enable the depth to which thecutting-tracer 24 may penetrate into the pattern relatively to the depthof penetration of the engravingtool 42, Fig. 1, into the work 4, to beadjusted preparatory to commencing the engraving operation. Aclamping-screw 43, threaded through the tube or bush 27 and adapted tobe screwed against the quill-holder 26, serves to hold the latter in anyposition to which it may be thus adjusted. A nut44, adjustable along thetube or bush 27 and adapted to abut against the top of'the sleeve 28,serves as a means of varying the maximum depth of the lines to be cut inthe work 4, and a nut 44, similarly adjustable below the sleeve 28, may

' be used for limiting the upward motion of the engraving-tool or theminimum depth of the lines to be'cnt by it in the work.

As described in the before-mentioned specification, No.684,973, an arm45 extends upward from and is integral with the above-named head 28 ofthe sleeve 28 and carries at its upper end a bearing 46, alined with theboss 32.

47 is a vertical bearing (shown in dotted linesin Fig. 1) for the quill48 of the engraving-tool42. Itis supported byastrongstandard 49, rigidlysecured to the adjustable table 9 and overhanging the plane of the work4 for a sufficient distance. In Fig. 1 the standard 1 is representedaspartly broken away, so as to enable other parts which would otherwise beobscured by such standard to be clearly illustrated.

50 is a bearing-block carried by and capable of turning about thebearing 47, and 51 is a rod pivoted on or between screw-centers 52 52,adjustable in screw-threaded sockets 53 53, depending from thebearing-block 50.

54 54 are a pair of arms fast to the rod 51 and projecting from it atright angles, as shown in dotted lines in Fig. 2. The outer ends of thearms 54 54 are slotted to receive the respective ends of a cross-head55, (represented in dotted lines in Fig. 2,) fast to the tube 56, withinwhich rotates the quill 48, carrying the engraving-tool 42.

57 is a lever fast on one end of the rod 51, from which it projects,standing parallel with the arms 54 54. The lever 57 is slotted at 58, asindicated in dotted lines in Fig. 2, to receive one end of a pin 59,whose other end is screw-threaded to receive a tightening-nut 60, whichis capable of pinching the said lever between itself and a collar 61(rigid on the pin 59) on the other side of the lever to hold the pin 59in the desired position lengthwise of the'slot 58 for a purposehereinafter described. The opposite end of the pin 59 is in slidingengagement with a diametrical slot 62 in a disk 63, fast on one end ofthe beforedescribed longitudinally-grooved rod 33,turning in a bearing64, carried by the before-described bearing-block 50, as also in theabovementioned bearing 46. The .disk 63 on the one side and a collar 65,fixed on the rod 33 at t the other side of the bearing 64, prevents thesaid rod from moving longitudinally through the bearing 64, as thepantograph linkage 10, 10?, 10 and 10 lengthens and shortens the bearing46 and boss 32, which are alined with the bearing 64, slidelongitudinally along the rod 33, all as described in the above-namedspecification, No. 684,973.

For the purpose of enabling the ratio of reduction of the first andsecond dimensions- 2'. e length and breadt-hto be adjusted the twopantograph-links 10 10 are slotted at 66 to admit of the points ofconnection 67 therewith of the link 10 to be varied, and the table 9 isguided in a slot 1 in the base 1 and is movable by a screw 68. Thisadjustment is effected by loosening the connections 67 and turning thescrew 68 in the required direction to the desired extent. The ratio ofreduction of the third dimension-11 e., depthis varied, as may bedesired, by adjusting the position of the pin 59 along the slotted lever57 and by fixing it in difierent positions along the slot 62, asdescribed in the specification.

above referred to.

The pantograph mechanism is preferably so arranged that there is aconstant slight tendency for the cutting-tracer 24 to descend.

When it is desired to produce a line-engraving in accordance with thisinvention,a much enlarged photograph is taken of the plate or device tobe reproduced, and this is suit-ably transferred or affixed to thebefore-1n entioned gypsum or equivalent plate or body 3, or, if saidplate or body 3 be provided with a suitable sensitized surface, thephotograph may be taken directly onto it. This prepared plate or body 3and the plate or body 4 to be engraved are then secured in their properpositions on the pattern-table 2 and work-table 5, respectively, and themotor appertaining to the engraving-tool 42 (which motor is not shown inthe drawings) and the motor 37 for driving the cutting-tracer 24 are setin operation. The operator then follows the lines depicted on thepattern 3 with the cutting-tracer 24, which will thus be caused to cutfurrows at all the parts so traversed, and according as these lines arethicker or thinner he respectively lowers or raises the cuttingtracer,so that it may penetrate more or less deeply into the pattern 3, andconsequently by reason of its conicity cut a Wider and deeper ornarrower and shallower furrow, the immediate object of the operatorbeing to cut away all and no more than the lines of the pattern. As themovements given by the operator to the cutting-tracer 24 are by thepantograph homologously transmitted to the engraving tool 42 and as thislatter is in itself homologous with the cutting-tracer, it follows thatthe resultant engraving must be an exact copy of the pattern at thepredetermined ratio of reduction, which ratio can, as previouslydescribed, be varied according to requirements.

It will be obvious that when so desired the operator may vary thetreatment of the subject in hand by causing the cutting-tracer 24 topenetrate into the pattern more or less deeply than is justified by thewidth of the lines of the pattern, and thereby correspondingly increaseor decrease the width of the lines engraved. Further variation oftreatment may be secured by using an engravingtool 42 and acutting-tracer 24 which are not homologous with each other.

If lines of only one uniform depth are to be engraved, it may beconvenient to mechanically retain the before-described sleeve or bush 27in a depressed position, and thereby hold down the cutting-tracer 24 andengraving-tool 42 in the positions necessary to secure the desireddegrees of penetration into, respectively, the pattern 3 and work 4.This may be effected by tightening the nut 44 against the under side ofthe sleeve 28, so as to deprive the sleeve or bush 27 of its independentmotion in the third dimension and for the time being convert thethree-dimension pantograph into a two-dimension one.

The before described engravingmachine may be used for the production ofstippled engravings, although not with such manifest advantages as thoseinherent to its application to the production of line-engravings.

I claim- 1. In athree-dimension engraving-machine the combination with apa'ntograph linkage and a rotating engraving-tool and rotating tracercarried thereon, of a sleeve fixed in the linkage, a bush longitudinallymovable in the sleeve and in operative connection with theengraving-tool, a quill-holder longitudinally adjustable in the bush, aclamping-screw in the bush adapted to engage the quill-holder,

a quill rotatable within the bush and carrying the tracer, ascrew-thread on the bush, a nut adjustable on this screw-thread adaptedto engage the sleeve, a screw-thread on the quill -'holder and a nutadjustable on this screw-thread adapted to engage the bush substantiallyas set forth.

2. In a three-dimension engraving-machine the combination with arotating engravingtool and rotating cutting-tracer, and a pantographlinkage in operative connection with both tool and tracer to operateeach homologously with each other, of a friable body bearing a patterncapable of being readily cut away by the cutting-tracer substantially asset forth.

In testimony that I claim the foregoing as myinventionlhave hereuntosigned myname in the presence of two subscribing witnesses.

MARK BARR.

"Witnesses:

CHAS. S. Woonaoirrn, WARWICK HY WILLIAMS.

